What's the name of this plant? An herb commonly used by the elderly, but I don't know its name.

The plant in the picture is Isatis indigotica.

1. Land selection and preparation. Sandy loam with flat terrain, good drainage and loose fertility should be selected and planted in alluvial soil. Before sowing, apply 3 000 ~4 000 kilograms of organic fertilizer per mu, and turn it 30 ~40 cm deep, and the sand can be slightly shallow. After leveling, make a flat bed with a width of 65 438+0.5-2.0 meters.

2. Breeding methods. Reproduce with seeds. At the beginning of April, the seeds were soaked in clear water for 4 hours, taken out and drained, then mixed with fine sand for sowing, with wide row drilling, and covered with thin soil after sowing; Or harvest and sow the seeds when they are ripe. The amount of seeds used per mu is about 2 kg.

3. On-site management. When the seedlings grow to 4-6 leaves, the seedlings are fixed and supplemented according to the plant spacing of 7- 10 cm. After full sowing, intertillage and weed every 10- 15 days 1 time until the line is closed. Before each intertillage, apply 25 kilograms of compound fertilizer per mu. The field should be topdressing compound fertilizer before sealing the warehouse. Drainage in rainy season, irrigation in the morning and evening when the weather is dry. Avoid watering in the sun. The seeds are harvested in May and June of the following year for spring sowing and autumn sowing. Choose plants with hard stems, which are not prone to lodging and have fewer pests and diseases.